Lightweight plastic container and preform

ABSTRACT

A plastic preform includes a hollow body portion including a closed base portion and a lower portion and a lower portion extending upwardly from the closed bottom portion; and a neck portion extending upwardly from the lower portion. The neck portion includes a dispensing opening positioned at a top of the neck portion, threads positioned below the dispensing opening, a tamper-evident formation having a lower surface and positioned directly below the threads, and a support flange having an upper surface and a lower surface and positioned below the tamper-evident formation. In an embodiment, the plastic preform is formed of a material comprising polyethylene terephthalate (PET), and a vertical distance from the lower surface of the tamper-evident formation to the lower surface of the support flange is from 0.125 to 0.150 inches. Containers and methods for molding preforms and making containers are also disclosed.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.17/314,721, filed May 7, 2021, which is a continuation of U.S. patentapplication Ser. No. 16/598,452, filed Oct. 10, 2019, which is acontinuation of U.S. patent application Ser. No. 16/013,139, filed Jun.20, 2018, now U.S. Pat. No. 10,457,437, which is a continuation of U.S.patent application Ser. No. 16/012,302, filed Jun. 19, 2018, now U.S.Pat. No. 10,266,299, which is a continuation of U.S. patent applicationSer. No. 15/495,084, filed Apr. 24, 2017, now U.S. Pat. No. 10,023,345,which is a continuation of U.S. patent application Ser. No. 15/404,731,filed Jan. 12, 2017, now U.S. Pat. No. 9,738,409, which is acontinuation of U.S. patent application Ser. No. 15/383,179, filed Dec.19, 2016, now U.S. Pat. No. 9,850,019, which is a continuation of U.S.patent application Ser. No. 15/220,731, filed Jul. 27, 2016, now U.S.Pat. No. 9,522,759, which is a continuation of U.S. patent applicationSer. No. 14/803,505, filed Jul. 20, 2015, now U.S. Pat. No. 9,403,310,which is a continuation of U.S. patent application Ser. No. 14/688,734,filed Apr. 16, 2015, now U.S. Pat. No. 9,139,326, which is acontinuation of U.S. patent application Ser. No. 14/511,848, filed Oct.10, 2014, now U.S. Pat. No. 9,033,168, which is a divisional of U.S.patent application Ser. No. 11/749,501, filed May 16, 2007, now U.S.Pat. No. 8,857,637, which is a continuation-in-part of U.S. patentapplication Ser. No. 11/368,860, filed Mar. 6, 2006, now U.S. Pat. No.7,708,159, all of which are incorporated herein by reference in theirentirety.

TECHNICAL FIELD

The present invention relates to plastic containers, including injectionmolded and/or blow molded containers.

BACKGROUND

It is desirable to improve the stability of plastic containers and thehandling of preforms that are used to form containers. At the same time,for economic and efficiency reasons, it is also desirable to providecontainers and preforms that are suitable for their intendedapplications yet have a reduced weight.

SUMMARY

A plastic preform includes a hollow body portion including a closed baseportion and a lower portion and a lower portion extending upwardly fromthe closed bottom portion; and a neck portion extending upwardly fromthe lower portion. The neck portion includes a dispensing openingpositioned at a top of the neck portion, threads positioned below thedispensing opening, a tamper-evident formation having a lower surfaceand positioned directly below the threads, and a support flange havingan upper surface and a lower surface and positioned below thetamper-evident formation. In an embodiment, the plastic preform isformed of a material comprising polyethylene terephthalate (PET), and avertical distance from the lower surface of the tamper-evident formationto the lower surface of the support flange is from 0.125 to 0.150inches. Containers and methods for molding preforms and makingcontainers are also disclosed.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the invention will now be described, by way of example,with reference to the accompanying drawings, wherein:

FIG. 1 is a front elevational view of a plastic container according toan embodiment of the invention.

FIG. 2 is a front elevation view of a preform according to anotherembodiment of the invention.

FIG. 3 is a cross-sectional view of a preform according to an embodimentof the invention.

FIG. 4 is a partial enlarged view of the area illustrated in FIG. 2 .

FIG. 5 is a partial cross sectional view of an upper portion of acontainer or preform according to an embodiment of the invention.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments of the presentinvention, examples of which are described herein and illustrated in theaccompanying drawings. While the invention will be described inconjunction with embodiments, it will be understood that they are notintended to limit the invention to these embodiments. On the contrary,the invention is intended to cover alternatives, modifications andequivalents, which may be included within the spirit and scope of theinvention as defined by the appended claims.

A representative container 10 according to an embodiment of the presentinvention is generally shown in FIG. 1 . Container 10 includes a lowersupporting base portion 12, a sidewall portion 14, and a neck portion16.

The sidewall portion may be cylindrical or non-cylindrical, and mayinclude various formations, for example, without limitation, labelpanels, strengthening ribs, etc. The neck portion 16 includes a supportflange 18 having an upper surface 20 and a lower surface 22. Supportflange 18 is generally provided to facilitate the handling ofcontainers, during formation and thereafter. Neck portion 16 furtherincludes a tamper-evident formation 28 and a dispensing opening 24positioned at, and formed by, the top of the neck portion 16. In anembodiment, the dispensing opening has an inner diameter that is atleast 22 mm. However, the dispensing opening may be of variousconventional or non-conventional sizes and may, for example, comprise acircular opening having an inner diameter from 22 mm to 29 mm.

Container 10 is comprised of plastic. In an embodiment, the containermay be comprised of polymer, such as a polymer that provides good visualclarity when bi-axially oriented like polyethylene terephthalate (PET).However, the invention is not limited to a specific polymer, andcontainers and preforms that are provided according to the teachings ofthe present invention may be comprised of a wide number of polymersand/or blends, including those that included recycled material.

The tamper-evident formation 28, may be continuous, as generallyillustrated, or may include one or more discontinuous formations. Inother embodiments, the tamper-evident formation may comprise a formation(e.g., a lug or lugs) that extends from the upper and/or lower surfaceof the support ring. However, the invention is not limited to theillustrated means for indicating tampering and other means forindicating tampering, such as a covering (e.g., a foil covering) may beused instead of or in addition to other tamper-evident formations.

Embodiments of the container may additionally include a shoulder portion15, a plurality of threads 26 for receiving a closure (not shown).Shoulder portion 15 may comprise an upper portion of the sidewallportion 14, and may extend inwardly into the neck portion 16, althoughmany container configurations do not include a shoulder portion. Afeature of containers according to embodiments of the present inventionis a lowering of the center of gravity. For most configurations andapplications, a lower center of gravity provides a container that ismore stable and less likely to tip during manufacturing, processing,and/or handling. The center of gravity is the point at which if a bodyis suspended it would be perfectly balanced. For uniformly consistent,symmetrical bodies, the center of gravity is at the geometrical center.For non-consistent or non-symmetrical bodies, the center of gravityneeds to be determined. Moreover, for purposes of the instantdisclosure, the center of gravity is associated with preforms and withcontainers that are in an unfilled condition.

The center of gravity for container 10 illustrated in FIG. 1 isgenerally shown at 50. It is noted that for the instant containerconfiguration, the center of gravity 50 is above the mid-height of thecontainer due to the additional material, and hence weight, that isprovided in the container finish portion—i.e., the neck portion 16.However, as described further herein, with a reduction in the verticallength and weight of the neck portion 16 (or elements thereof), thecenter of gravity for a container produced in accordance with theteachings of the present invention may have a center of gravity (e.g.,50) that is vertically lower than that of a container that employs aconventional (vertically longer and heavier) neck portion. For example,without limitation, the ratio of the vertical height of the center ofgravity to the vertical height of the container may be less than 0.57.Notably, for some embodiments the ratio may be less than 0.53.

Additionally, in an embodiment of the invention, portions of thecontainer—exclusive of the neck portion—may be stretched (e.g., in astretch blow molding operation) to more than 3 times their initial(i.e., preform component) length in the axial direction.

As one would also expect, with a reduction in the vertical length andweight of the neck portion, the center of gravity for an associatedpreform will also be reduced when compared to an preform of likematerial and design below the neck portion that includes a longervertical and heavier neck portion.

FIGS. 2 and 3 generally illustrate a preform 40 according to anembodiment of the invention. Preform 40 can, for instance, be used toform a wide variety of containers, including a container such as thatillustrated in FIG. 1 . By way of example, without limitation, preform40 may be injection molded and/or blow molded, and may form an almostlimitless number of container configurations. FIG. 4 . depicts anenlarged portion of FIG. 2 .

Preform 40 is also shown including a neck portion 42. For manyapplications, the neck portion provided in connection with a preformwill remain substantially the same, and have substantially the samedimensions, as the neck portion of a molded container produced from thepreform. Consequently, the neck portion 16 of the container 10 and theneck portion 42 of the preform may be substantially consistent, whilethe remaining portions of the preform and container—i.e., those belowthe respective neck portions—may change significantly. For ease ofreference, common elements in the neck portion of the illustratedcontainer and the neck portion of the illustrated preforms are providedwith common reference numerals.

FIG. 5 illustrates a partial cross sectional view of an upper portion ofa preform or a container formed from preform. In an embodiment, such asthat generally illustrated, the vertical distance X from the top of thedispensing opening/neck portion (e.g., point 30) to the lower surface 22of the support flange 18 (e.g., point 32) is 0.580 inches or less. Forsome embodiments, X may be 0.500 inches or less; for other embodiments,vertical distance X may be less than 0.450 inches.

Moreover, as generally illustrated, the vertical distance H from the topof the dispensing opening/neck portion (e.g., point 30) to the uppersurface 20 of the support flange 18 may be 0.50 inches or less. For someembodiments, H may be 0.40 inches or less. Also, for some embodiments,the vertical distance D from the top of the dispensing opening/neckportion (e.g., point 30) to the lower surface of the tamper-evidentformation (e.g., point 34) may be 0.30 inches or less.

In an embodiment, the vertical distance J from a furthestradially-extending portion of the lower surface of the tamper-evidentformation 28 (e.g., point 36) to the upper surface 20 of the supportflange 18, which generally equates to H minus D, may be 0.15 inches orless. For some embodiments, J may be 0.10 inches or less, and for otherembodiments, vertical distance J may be less than 0.09 inches. For yetother embodiments, vertical distance J may be less than 0.08 inches.

Also, in an embodiment of the invention, the vertical distance between afurthest outwardly radially-extending portion of the lower surface ofthe tamper-evident formation (e.g., point 36) to the lower surface 22 ofthe support flange 18 at the same outward radial distance—which maygenerally equate or coincide with X minus D— is 0.20 inches or less, andfor some embodiments may be 0.15 inches or less.

In an embodiment, support flange 18 has a radially extending length Lithat is 0.20 inches or less. For some applications, length Li may befurther reduced to 0.17 inches or less. With further reference tosupport flange 18, the angle—from horizontal—provided by a furthestoutward radially extending portion of the lower surface 22 of supportflange 18 (e.g., point 32) to the nearest radially-extending portion ofthe upper surface 20 of the support flange 18 is 16° or greater, and maybe 20.0°±2°. However, for some embodiments, such as that generallydepicted in FIG. 5 , whereas a blending radius is provided to transitionsupporting flange 18 into an adjacent vertical portion of the neck(e.g., segment 39), the nearest radially-extending portion of the uppersurface 20 of support flange 18 may be a theoretical position withinsupporting flange 18—e.g., point 38. Furthermore, for some embodiment,the least distance from a furthest radially-extending portion of thesupport flange (e.g., point 32) to the upper surface of the dispensingopening (e.g., at or about 30) is 0.60 inches or less, and for some neckportions may be 0.50 inches or less.

Embodiments of preforms and containers may have a neck portion thatweighs 3.0 grams or less. For some embodiments, the weight of the neckportion can be 2.3 grams or less. Further, for a 500 ml version of acontainer made in accordance with an embodiment of the invention, thetotal weight of the preform and an unfilled weight of a containerproduced from such a preform may be 11 grams or less, and for someembodiments may be 10 grams or less. Of course, for many embodiments,without limitation, the preform and resulting container will weigh atleast 9 grams.

By providing a neck portion 16 for a container 10 that incorporates oneor more aspects of the foregoing embodiments, the center of gravity(see, e.g., 50 in FIG. 1 ) for the container may be lowered. For e.g.,for a 500 ml container of with a configuration as generally shown inFIG. 1 , the weight of the neck portion may be reduced from aconventional 3.4 to 2.0 g. Based on such a reduction in weight, thecenter of gravity (see, e.g., 50) may become at least about 0.48 incheslower than that provided for a similarly configured container having a3.4 g finish—and will likely be about 0.48 and 0.58 inches lower thanwith the heavier (e.g., 3.4 g) conventional finish. Providing a neckportion in accordance with embodiments disclosed herein for such acontainer can provide a lowering of center of gravity as a percentage ofheight from bottom that ranged from about 4.5% to about 6% when comparedto a similar container with a conventional 3.4 g neck portion. Moreover,when a container such as that discussed in this paragraph (e.g., 2.0 gneck portion/finish) is compared to a conventional container (e.g. 3.4 gneck portion/finish), the calculations provide a drop or lowering incenter of gravity that provides an approximately 10.5% to 12.2% relativepercent change (i.e., percent improvement).

It is noted that in addition to the material and economic benefits thatmay be achieved by “light-weighting” and lowering a comparative centerof gravity in a resultant container, a lowering in the center of gravityof a preform may also provide certain manufacturing benefits. Forexample, without limitation, a preform with a comparatively lower centerof gravity may provide for improved sorting and/or handling duringproduction and manufacturing. That is, among other things, a preformwith a lower center of gravity can provide for comparatively more stableor improved retention and processing. Similarly, a container with alower center of gravity may exhibit improved handling, for instance,without limitation, in connection with de-palletizing or with “tabletop” conveying systems. Further, a lower center of gravity can provide acontainer, filled or unfilled, with improved stability. It is furthernoted, however, that the present invention is not limited to containersthat are blown and filled in distinct or separate operations. That is,without limitation, preforms and containers provided in accordance withthe teachings of the present invention also lend themselves for use inconnection with various conventional “blow-and-fill” operations,including those in which a container is filled just after formation(e.g., within seconds of formation) in close proximity to where thecontainer is formed. The operation comprising the blow-and-fill may be asingle, integrated machine, or may be comprised of two or more separatedevices that are adjacent or in close proximity to one another.

The foregoing descriptions of specific embodiments of the presentinvention have been presented for purposes of illustration anddescription. They are not intended to be exhaustive or to limit theinvention to the precise forms disclosed, and various modifications andvariations are possible in light of the above teaching. The embodimentswere chosen and described in order to explain the principles of theinvention and its practical application, to thereby enable othersskilled in the art to utilize the invention and various embodiments withvarious modifications as are suited to the particular use contemplated.It is intended that the scope of the invention be defined by the claimsappended hereto and their equivalents.

What is claimed is:
 1. A plastic preform comprising: a hollow bodyportion, comprising: a closed bottom portion; and a lower portionextending upwardly from the closed bottom portion; and a neck portionextending upwardly from the lower portion, the neck portion including: adispensing opening positioned at a top of the neck portion; threadspositioned below the dispensing opening; a tamper-evident formationpositioned directly below the threads, the tamper-evident formationhaving a lower surface; and a support flange positioned below thetamper-evident formation, the support flange having an upper surface anda lower surface; wherein the plastic preform is formed of a materialcomprising polyethylene terephthalate (PET); and a vertical distancefrom the lower surface of the tamper-evident formation to the lowersurface of the support flange is from 0.125 to 0.150 inches.
 2. Theplastic preform according to claim 1, wherein a vertical distance fromthe top of the neck portion to a lower surface of the tamper-evidentformation is from 0.30 to 0.31 inches.
 3. The plastic preform accordingto claim 1, wherein a vertical distance from the top of the neck portionto a lower surface of the tamper-evident formation is about 0.31 inches.4. The plastic preform according to claim 1, wherein a vertical distancefrom the lower surface of the support flange to a top of the neckportion is from 0.425 to 0.500 inches.
 5. The plastic preform accordingto claim 1, wherein a vertical distance from the lower surface of thesupport flange to a top of the neck portion is from 0.435 to 0.500inches.
 6. The plastic preform according to claim 1, wherein a verticaldistance from the lower surface of the support flange to a top of theneck portion is from 0.425 to 0.450 inches.
 7. The plastic preformaccording to claim 1, wherein a vertical distance from the lower surfaceof the support flange to a top of the neck portion is from 0.450 to0.500 inches.
 8. The plastic preform according to claim 1, wherein thethreads comprise non-vented threads.
 9. The plastic preform according toclaim 1, wherein the threads comprise multiple-lead threads.
 10. Theplastic preform according to claim 1, wherein a vertical distance fromthe upper surface of the support flange to a top of the neck portion isfrom 0.40 to 0.50 inches.
 11. A plastic preform comprising: a hollowbody portion, comprising: a closed bottom portion; and a lower portionextending upwardly from the closed bottom portion; and a neck portionextending upwardly from the lower portion, the neck portion including: adispensing opening positioned at a top of the neck portion; threadspositioned below the dispensing opening; a tamper-evident formationpositioned below the threads, the tamper-evident formation having alower surface; and a support flange positioned below the tamper-evidentformation, the support flange having an upper surface and a lowersurface; wherein the plastic preform is formed of a material comprisingpolyethylene terephthalate (PET); and a vertical distance from the lowersurface of the support flange to a top of the neck portion is from 0.425to 0.500 inches.
 12. The plastic preform according to claim 11, whereina vertical distance from the lower surface of the tamper-evidentformation to the upper surface of the support flange is from 0.08 to0.10 inches.
 13. The plastic preform according to claim 11, wherein avertical distance from the lower surface of the support flange to a topof the neck portion is from 0.435 to 0.500 inches.
 14. The plasticpreform according to claim 11, wherein a vertical distance from thelower surface of the support flange to a top of the neck portion is from0.425 to 0.450 inches.
 15. The plastic preform according to claim 11,wherein a vertical distance from the lower surface of the support flangeto a top of the neck portion is from 0.450 to 0.500 inches.
 16. Theplastic preform according to claim 11, wherein the threads comprisenon-vented threads.
 17. The plastic preform according to claim 11,wherein the threads comprise multiple-lead threads.
 18. The plasticpreform according to claim 11, wherein a vertical distance from the topof the neck portion to a lower surface of the tamper-evident formationis about 0.31 inches.
 19. The plastic preform according to claim 11,wherein a vertical distance from the upper surface of the support flangeto a top of the neck portion is from 0.40 to 0.50 inches.
 20. A plasticpreform comprising: a hollow body portion, comprising: a closed bottomportion; and a lower portion extending upwardly from the closed bottomportion; and a neck portion extending upwardly from the lower portion,the neck portion including: a dispensing opening positioned at a top ofthe neck portion; threads positioned below the dispensing opening; atamper-evident formation positioned directly below the threads, thetamper-evident formation having a lower surface; and a support flangepositioned below the tamper-evident formation, the support flange havingan upper surface and a lower surface; wherein the plastic preform isformed of a material comprising polyethylene terephthalate (PET) andincludes recycled material; an outside diameter of the support flange isgreater than 22 mm and less than or equal to 39.2 mm; and a verticaldistance from the lower surface of the tamper-evident formation to theupper surface of the support flange is from 0.08 to 0.10 inches.
 21. Theplastic preform according to claim 20, wherein a vertical distance fromthe top of the neck portion to a lower surface of the tamper-evidentformation is about 0.31 inches.
 22. The plastic preform according toclaim 20, wherein a vertical distance from the lower surface of thetamper-evident formation to the lower surface of the support flange isabout 0.125 inches.